A solvent-free method for the direct synthesis of Cbz-protected β-amino ketones using triphenylphosphine dibromide
作者:Pori Buragohain、Partha Pratim Saikia、Nabin C. Barua
DOI:10.1016/j.tetlet.2013.04.105
日期:2013.7
Triphenylphosphinedibromide (TPPDB) has been found to be a very effective catalyst for the one pot three-component Mannich reactions of aryl aldehyde, acetophenone, and benzyl carbamate under solvent-free condition at room temperature. The advantageous features of this methodology are operational simplicity, shorter reaction time, cost-effectiveness, and excellent yields. The catalyst possesses distinct
Highly Efficient Aza-Michael Reactions of Enones with Carbamates Using a Combination of Quaternary Ammonium Salts and BF<sub>3</sub>·OEt<sub>2</sub>as a Catalyst
作者:Chun-Gu Xia、Li-Wen Xu、Lyi Li、Shao-Lin Zhou、Jing-Wei Li、Xiao-Xue Hu
DOI:10.1055/s-2003-43333
日期:——
Aza-Michael reactions of enones with carbamates took efficiently in the presence of a catalytic amount of quaternary ammonium salts and BF 3 .OEt 2 to afford the total products in high yields. The new catalytic system was also efficient in the aza-Michael reaction of chalcone, which was difficult to react with carbamates by transition metal salts catalysts.
N-Benzyloxycarbonylamino sulfones react with aromatic ketones in the presence of catalytic amount of boron trifluoride-diethyl ether at room temperature to afford the corresponding protected β-amino ketones in high yields (71-87%). α-amido sulfones - stable imine precursors - aromatic ketones - BF3˙OEt2 - Lewis acids - β-amino ketones Part 200 in the series ‘Studies on Novel Synthetic Methodologies’
Heteropoly Acids Catalyzed Direct Mannich Reactions: Three-Component Synthesis of N-Protected β-Amino Ketones
作者:Xiaoxia Lu、Rui Wang、Taikun Huang、Lin Shi、Bogang Li
DOI:10.1055/s-2007-984913
日期:——
catalyzed one-pot three-component Mannich reactions of aryl aldehydes, aryl ketones, and carbamates at ambient temperature and afforded the corresponding N-protected beta-amino ketones in good to excellent yields. This method provides a novel and improved modification of three-component Mannich reactions in terms of a wide scope of aldehydes, ketones and carbamates, economic viability and reusability.
Transition Metal Salt-Catalyzed Direct Three-Component Mannich Reactions of Aldehydes, Ketones, and Carbamates: Efficient Synthesis of N-Protected β-Aryl-β-Amino Ketone Compounds
作者:Li-Wen Xu、Chun-Gu Xia、Lyi Li
DOI:10.1021/jo048778g
日期:2004.11.1
three-component Mannich reactions of aryl aldehydes, aryl ketones, and carbamates are described. The RuCl3·xH2O-, AuCl3−PPh3-, and AuCl3-catalyzed direct Mannich reactions led to the synthesis of N-protected β-aryl-β-amino ketones, and the results create new possibilities for exploiting the transition metal salt-catalyzed direct Mannich reaction and facile synthesis of β-amino ketone libraries.
描述了过渡金属盐催化的芳基醛,芳基酮和氨基甲酸酯的直接三组分曼尼希反应。RuCl 3 · x H 2 O-,AuCl 3 -PPh 3-和AuCl 3催化的直接曼尼希反应导致N保护的β-芳基-β-氨基酮的合成,其结果为开发新的可能性提供了可能性过渡金属盐催化的直接曼尼希反应,并且易于合成β-氨基酮库。